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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

There are no test data for the substance. However a 72-hour EC50 value of >833 mg/L and a NOEC of 167 mg/L have been determined for the effects of the related test substance,  3-chloropropyltrimethoxysilane (2530-87-2), on growth rate of Scenedesmus subspicatus (new name: Desmodesmus subspicatus). It is likely that the test organisms were predominantly exposed to the hydrolysis products of the substance.

Key value for chemical safety assessment

Additional information

No test data for toxicity aquatic algae and and cyanobacteria are available for Trichloro(3-chloropropyl)silane. However a study of toxicity to aquatic algae is available for the related substance 3-chloropropyltrimethoxysilane. Trichloro(3-chloropropyl)silane (CAS 2550-06-3) and 3-chloropropyltrimethoxysilane (2530-87-2) both hydrolyse to 3-chloropropylsilanetriol. The hydrolysis half-lives of Trichloro(3-chloropropyl)silane and 3-chloropropyltrimethoxysilane indicate that, under conditions relevant to ecotoxicity assessment, both will hydrolyse to chloropropylsilanetriol over the course of the test. The other hydrolysis products are methanol and hydrogen chloride, respectively; the properties of these substances are well characterised. Methanol is non-toxic to the environment and it is considered unlikely that its presence significantly affected the results of the test performed with 3-chloropropyltrimethoxysilane.Effects of hydrogen chloride on aquatic organisms are limited to those that result from changes to pH in unbuffered media.